Magnetic speedometer



A l 1625142 Apu! 19 1927 J. K.voLsEN MAGNETIC SPEEDOMETER Filed I ulyl2, 1922 2 Sheets-'Sheet 2 Patented Apr. 19, 1927.

UNITED STATES 1,625,112' PATENT QFFIQE JOI-IN K. OLSEN, OF CHICAGO,ILLINOIS, ASSIGNOR TO STEWART-WARNER SPEEDOM- ETER CORPORATION, OFCHICAGO, ILLINOIS, CORPORATION OF VIRGINIA.

MAGNETIC SPEEDOIVIETER.

Application filed July 12, 1922.

The purpose of this invention is to provide a speedometer of themagnetic type, adapted with a given weight of magnet and a given speedof rotation to produce a stronger drag effect upon the drag andindicating element and to be more economical in construction than themagnetic speedometers in common use. It consists in the elements andfeatures of construction shown and described as indicated in the claims.

In the drawings Figure l is a face View of an instrument comprising aspeedometer mechanism, the face plate of the instrument being brokenaway to disclose the speedometer element.

Figure 2 is a top plan view with the casing broken away.

Figure 3 is a front elevation of parts shown in Figure 2 with thegraduated flange ordial member of the drag element partly broken away.

Figure 4 is a section at the line, 4 4, on Figure Q.

Figure 5 is a section at the line, 5 5, on Figure 2.

Figure 6 is a perspective view of the field plate. v I

Figure 7 is a perspective view of the dragdial cup member broken at thecorner for showing its sectional form.

Figure 8 is a detail section at the line 80 on Figure 4.

The drawings show a frame or supporting member, A, which in the combinedinstrument comprising this Aspeedometer is the supporting member alsofor the odometer mechanism, not shown herein. Of this frame member, A1,is the journal bearing for the rotating magnet, B, whose carrying shaft,B1, is journaled vertically in said bearing, the means. of rotation, notparticularly concerned in this invention, being indicated by theintermeshing gears, HX and BK, HX being on the driving. shaft, H, and Bbeing on the magnet shaft. The magnet shaft, B1, is axially hollow forpermitting the shaft or spindle, j', of the drag element, F, to eX- tendthrough it, said spindle being afforded a step bearing in the jewel,a1", mounted in the jewel holder, A1?, which is screwedinto the lowerend of said journal bearing, A1. The Lipper bearing of the spindle, j",is obtained at grat the center of the field plate which is formed andmounted as hereinafter described.

Serial No. 574,522.

'and upon the upper end of these posts, there are formedl seats on whichrespectively, there are secured rigidly by one end, bi-metallic bars,A10, A10, A10, which project inwardly over the magnet, drag element andfield plate, so as to terminate overhanging three points equally spacedapart in a circle about the aXis of the magnet, outside the areaoccupied by the biasing spring, R. From the overhanging ends of' thesebi-metallic bars the field plate, Gr, is suspended by means of threadedstuds, g1, projecting through apertures in the ends of said bimetallicbars, A10, Vprovided with nuts, g2, above said bars, a spring, is, beingcoiled around the studs between the field plate and the bi-metallic barsfor yieldingly and adjustably spacing the field plate downwardly fromthe overhanging ends of the bimetallic bars.

The same post, a0, which carries two of the bi-metallic bars, A10,serves for carrying also a check bar, J, made in T form with the crossof the T secured at its end by the two screws, IL, which secure thebi-metallic bars, A10, to the posts, a0. The free end of said checkfinger overhanging the upper end of the drag disk spindle, f, checks itand the drag disk against vertical movement without exerting anypressure on said spindle which might increase its friction in its stepbearings.

The rotating magnet, B, is of the split ring form, the ring beingrelatively wide and thin, as may be seen most clearly in Figures 4 and5; and thereby with a given weight of magnet, there is obtained, notonly a relatively large area of flux to be intercepted by the drag disk,but also a relatively long radius and consequently relative lfield platein a zone at the circumference of the Kmagnet and causing it to be cutat said Zone by a relatively'large cross section of lthe `drag element,said Ydrag element is upward 101111011 11s s101111 111 Y1"i1.1;11r0.1 1:11111 'T 11'11'11 11 (101110551111 111111111111' 1101111011, 11":111111111011111' 1111 111111111111 11011011v 1100,11 1"* 1111510111111101:10111 1110 1101120111111 W01) 01?' 11110 (1111111 dis; 111 11110 0ir-011111101101100. w110-11 011101' S1110 1110111110 in 11 1101101010111'11111100, 1*". 111111 011111111111' 11 0111111- 11110111 11011 111" if,10 010111111111;1l 11111 0ir(11111'1"e1'- (111110 01 i110 111111111101.0111111011 111111111111( Aifi-(1111 1110 111111110. 1', 1y 01111v 1110s111110 distance by 011111111 1111111 1111111.10 5111100111111111111111151 1110111 1110 1111111110175 (1111111111110101'100. '1`0(w1-(1110111111 1111 111111 111111111111111 01 1110 1111111; disk. 11101 11111111 is: 11111111111111111111 11111101111 :is y0011 111 (-11.1:11111 11111110 11001;; 11111111111 111111 11101 i11- 11'111'11 1101111111 111111111111' (111111111110111 11011. F3, 01E 11110 (1111111`11101;. 17'11011 101111111111110: t11111Y 1110 1111 1101111111111' 0r('11g 1110 111111111101 1111111, and 1110 111111.11 1111K. 11'111 110 l(101101111111 0111` (11l i111 1101111111 1111111 111' 11111110111111101111 11111-11011 01 1110 1111111 11111111 1111111111011;-1111id 1111115.11, (11, if; 11111)' 1111 11111111111111111111 1111111111.0 1111111 (11 1110 1111?; (1110 10111151101101111011 1110111110111111111111 00111200 1111111' 111 1111111101131111111111v1'1111105111111111 11:11 1110 11011011 111111` 111111 X11 1111911.311111 k1: 1110111 \\11('11 i1: 11'i11 110 1.10011 111111' 11110(1101111111 01: 11111 111011 (11' 1110 (11'1111' (111410 111111 similardisiiinrg1v 01. 11111 110111 1111111 11s (1011111111011. (11101111100 1011101111011 wry 0011s11101111.11)v 1110 (f1-000001111'1011111 111111101E 1110 111x151` disk 11111111 1:1 (1111'A 1111 11111 1111.' 0r11111011 (1111s 1110 111100 01z 11011' 01 111111. C110 11101111100(11111l 1110 101111 (11' 1111111' disk 111'11'1101111 11110 11011011'110110, 1"". :11111 :1:01111 (11' 110111 1111110 01111101111 1111011p-111111011 11111100. (1'. 111 respect 10 1110 1111011 (11E (11'110010.1110111. 111111110' radius averaging 111111 (1i 11110 0111111'0i101'1111101'011011 0,1 1110 111111111101 11'111011 (111th` 11101111110 (11i 110W 01 1110 11111;. 11011111- 1111111 W11i1111 (11111 11000011 by 01.111111111111111' 1110 1111011 01 1110 011111111 1101111-10111111131 id0s1\1*i111 1110 110111110111111 1111111 111111011 i1(1001111100. '1110 1100111111111 1111'00 11101-01150 111 1110011101011011 01 111111 11111111101Y "101' (1111011111111 111e dis-1c.111111105 i1 11051011110 t0 011111101' 11. S11-011001' 11111111110'11111-11111'. 111111 111111111001101,- 1110 s01101- 11111111111I 01"1110 111.01111111101111 10 011111011000 1101 11111111111 t0 1110 $11001110 110 1101-0111011 (11' i11- 11111111011.

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2. In the construction defined in claim l, the field member being thinsheet metal fianged away from the magnet at its circumference proximateto the two-ply bead of the drag element.

3. In a magnetic speedometer, in combination with a rotating magneticelement, a field member positioned for concentrating the fiux in a planetransverse to the plane of rotation of the magnet, and a drag elementinterposed laterally with respect to the magnet between the same and thefield member, the drag element and the field member being concentricallyflanged laterally opposite the circumferential margin of the magnet andaway from the magnet, the drag element having its flange reflexed toextend past the circumferential periphery of the magnet and render theportion laterally opposite the magnet two-ply, for increasing thecross-section of the drag element at a zone of maximum radius into whichthe magnetic flux is deiected by the field plate.

Il. In a magnetic speedometer a rotary ring-shaped magnet, a mount bywhich it is carried; a spindle for the mount at whose upper end themount is located; a journal bearing for the spindle; a driven gear onthe spindle at the lower end thereof and of said bearing, and a drivinggear meshing with said driven gear, the magnet having a lubricantchamber within the inner circumference of the magnet ring with flowapertures leading to the upper end of the spindie journalbearing;-whereby lubricant is supplied froml said chamber to saidjournal bearing and thence over the surface of the gearat the lower endthereof to the intermesh of the two gears,

5. In a magnetic speedometer which comprises in combination with a framestructure a rotary magnet, a fixed laterally-positioned field plate, andan oscillating drag element co-axial with the magnet; a stop-bar for theupper end of the drag spindle, and bimetallic bars for supporting thefield plate; the

frame having abutments affording seats of lodgement and support spacedapart around the magnet, field plate and drag elements, the bimetallicbars being secured each at one end to said seats respectively, thespindlestopping bar being carried by securement upon one of said seatsby the same means which secures the bimetallic bar or bars thereon.

6. In the construction defined in claim 5, the spindle-stopping barbeing T-shaped with the cross of the T spanning the distance between twoof said seats for lapping upon both of them, for securement by the samemeans which secures the two bimetallic bars upon two a'butmentsrespectively.

In testimony whereof, I have hereunto set my hand at Chicago, Illinois,this 5th day of July, 1922.

JOHN K. OLSEN.

